90997851 has 12 divisors (see below), whose sum is σ = 141139752. Its totient is φ = 51998688.

The previous prime is 90997849. The next prime is 90997871. The reversal of 90997851 is 15879909.

It is not a de Polignac number, because 90997851 - 2¹ = 90997849 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 90997851.

It is not an unprimeable number, because it can be changed into a prime (90997811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 309370 + ... + 309663.

It is an arithmetic number, because the mean of its divisors is an integer number (11761646).

Almost surely, 2^90997851 is an apocalyptic number.

90997851 is a deficient number, since it is larger than the sum of its proper divisors (50141901).

90997851 is a wasteful number, since it uses less digits than its factorization.

90997851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 619050 (or 619043 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 48.

The square root of 90997851 is about 9539.2793752987. The cubic root of 90997851 is about 449.7906038124.

The spelling of 90997851 in words is "ninety million, nine hundred ninety-seven thousand, eight hundred fifty-one".